Everything about Anaspida totally explained
» For turtles, see Anapsida.
The
Anaspida ("Without Shields") are stem
gnathostomes, and are classically regarded as the ancestors of lampreys. Anaspids were small marine
agnathans that lacked scales and paired fins. They first appeared sometime during the early
Silurian, and flourished until the
Late Devonian Extinction Event, during the late
Devonian, where most species, save for
lampreys, went extinct due to the environmental upheaval during that time. The gills opened as a row of holes along either side of the animal that typically numbered anywhere from from 6-15 pairs.
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